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setting up 09 yz450f suspension for big boy

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Hey there, Im 270 lbs and just got my 09 yz450f. It runs and rides fine, but jumping on stock suspernsion, its darn near bottoming out. I was wondering what spring rate do you guys recommend that run. Is there anything I can do to the stock suspension as far as rebound on it with springs to make it better? Any help is appriciated! Thanks!

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Race tech has a spring calculator to figure out what spring you need for your weight. Some say its not very accurate, that part I'm not sure about. Your best bet would be call Dave J at smart performance, ENZO or Factory Connection and get their recomendation for spring rate. And then order the springs online.

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Looks like I will need a 6.7 in the rear with 5-8mm preload. And the front will be a .52. Hopefully that will get me where I need to be at.

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